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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: ...!2.eu.feeder.erje.net!feeder.erje.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Cursitor Doom Newsgroups: sci.electronics.design Subject: Re: kids these days Date: Mon, 30 Sep 2024 16:46:48 +0100 Organization: A noiseless patient Spider Lines: 66 Message-ID: References: <7bglfjtll1os4g6pfqhf1i7jl0acmrvlqv@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Injection-Date: Mon, 30 Sep 2024 17:46:49 +0200 (CEST) Injection-Info: dont-email.me; posting-host="befe3a24877ef5311303284f03fdebbd"; logging-data="2417190"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/FjrxdgEdFyIV+p8G3yyKl91cojleoqPs=" User-Agent: ForteAgent/8.00.32.1272 Cancel-Lock: sha1:vuTq4QJqywwVRz090LMWMIeYxKc= Bytes: 3835 On Mon, 30 Sep 2024 08:24:38 -0700, john larkin wrote: >On Mon, 30 Sep 2024 11:13:56 +0100, Cursitor Doom >wrote: > >>On Mon, 30 Sep 2024 05:15:02 GMT, Jan Panteltje >>wrote: >> >>>On a sunny day (Sun, 29 Sep 2024 10:36:26 -0700) it happened john larkin >>> wrote in : >>> >>>>I wouldn't hire someone who complicates a simple question into >>>>paralysis. >>>> >>>> >>>>I draw a 10 volt battery connected to two resistors, 9K in series with 1K. >>> >>>The problem there is 'draw', no reality. >>>The battery will have an internal resistance, maybe discharged too. >>> >>>>What's the voltage across the 1K? >>> >>> >>> >>>>I hired a 3-month intern a month ago who failed the test. He said 9 >>>>volts. I hired him anyway and fired him as an intern on Friday. He's >>>>full time now. He's mostly a software engineer. I'm teaching him basic >>>>electronics now. >>> >>>Well, that is OK. >>>But needs experimenting, building circuits, else all vaporware. >>>Same with software, write it, test it, else just imagination... >>>It may not be / work for everybody.. >>>Some run for US precedent.. >>>When I have to believe the crap trump puts out these days (about Iran for example) >>>4 sure (or maybe even 00 sure ) we will have >>>WW3 no matter who is winning the electtions. >>> >>> >>>>I dream of some day finding a kid who gets the voltage divider right >>>>and has something intelligent so say about the next test, an NPN >>>>emitter follower. >>> >>>Ge or Si? >> >>John mentioned a Vb of 0.6V so the 'student' is expected to know it's >>silicon. And of course, it's a Vbe of 0.6V and that distinction seems >>to trip up a lot of young folks, it seems. The Vb is 5. Once they get >>that straight, the rest of it falls into place easily enough. Should >>take < 30s for someone to figure out - and hopefully < >No, I said that one EE grad claimed that Vb (not Vbe) would be 0.6 >volts to ground. > >Can anyone here say about what the base and emitter voltages actually >are? Collector current? > >+10 supply, two 10Ks making a divider into the base, 1K emitter to >ground, typical small silicon NPN. > >Extra credit: anything else to say? Seriously? Vb is 5V. Vbe is 0.6V so Ve is 4.4V which gives us an Ie of 4.4/1000 = 4.4mA. Ic will be slightly less obviously but to a first approximation we usually take them to be the same. Vc = 10V. I don't see how anyone can get tripped up by this.